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On a related note - "High CO2 Makes Crops Less Nutritious" https://www.nationalgeographic.com/news/2014/5/140507-crops-nutrition-climate-change-carbon-dioxide-s

• londons_explore 6y ago
  If you want to grow crops in a low CO2 environment, just grow them in a greenhouse with near zero ventilation. The CO2 levels in the greenhouse will drop rapidly, and the plants will grow much slower. Don't add mulch or fresh topsoil, because that gives off a lot of carbon, especially when disturbed.